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DWARF and SMALL SEED1, a Novel Allele of OsDWARF, Controls Rice Plant Architecture, Seed Size, and Chlorophyll Biosynthesis

文献类型： 外文期刊

作者： Li, Yan 1 ; Huang, Renquan 1 ; Li, Jianrong 1 ; Huang, Xiaozhen 1 ; Zeng, Xiaofang 1 ; Zhao, Degang 1 ;

作者机构： 1.Guizhou Univ, Inst Agrobioengn, Key Lab Plant Resources Conservat & Germplasm Inn, Minist Educ, Guiyang 550025, Peoples R China

2.Guizhou Univ, Coll Life Sci, Guiyang 550025, Peoples R China

3.Guizhou Acad Agr Sci, DUS Testing Ctr New Plant Varieties China, Guiyang Stn, Guiyang 550006, Peoples R China

关键词： Brassinosteroid; chlorophyll biosynthesis; dss1 mutant; OsDWARF gene; panicle architecture

期刊名称：PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：1.039； 五年影响因子：0.77 ）

ISSN： 0031-9457

年卷期： 2021 年 90 卷 1 期

页码：

收录情况： SCI

摘要： Plant architecture is a vital agronomic trait to control yield in rice (Oryza sativa L.). A dwarf and small seed 1 (dss1) mutant were obtained from the ethyl methanesulfonate (EMS) mutagenized progeny of a Guizhou glutinous landrace cultivar, Lipingzabianhe. The dss1 mutant displayed phenotypes similar to those of brassinosteroid (BR) deficient mutants, such as dwarfing, dark green and rugose erect leaves, small seeds, and loner neck internode panicles with primary branching. In our previous study, the underlying DSS1 gene was isolated, a novel allele of OsDWARF (OsBR6ox) that encodes a cytochrome P450 protein involved in the BR biosynthetic pathway by MutMap technology. In this work, we confirmed that a Thr335Ile amino acid substitution residing in DSS1/OsDWARF was responsible for the dwarf, panicle architecture, and small seed phenotypes in the dss1 mutants by genetic transformation experiments. The overexpression of OsDWARF in the dss1 mutant background could not only recover dssl to the normal plant height and panicle architecture but also rescued normal leaf angles, seed size, and leaf color. Thus, the specific mutation in DSS1/OsDWARF influenced plant architecture, seed size, and chlorophyll biosynthesis.

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